CVE-2026-74946CWE-119

CVE-2026-74946

High · published August 18, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
41.3
In the wild
Unconfirmed
What it is

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00491 · 41.3th percentile
Weakness
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer
Published
2026-08-18T17:17Z
Affected products (5)
ProductVersionsFixed in
mozilla/firefox< 115.39.0115.39.0
mozilla/firefox≥ 116.0, < 140.14.0140.14.0
mozilla/firefox≥ 141.0, < 153.1.0153.1.0
mozilla/thunderbird< 140.14.0140.14.0
mozilla/thunderbird≥ 141.0, < 153.1.0153.1.0
References (8)
https://bugzilla.mozilla.org/show_bug.cgi?id=2059997 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-74/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-75/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-76/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-77/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-78/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-79/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-80/ · [email protected]
EPSS history
Timeline
  • 18 AUG 12:23Z
    Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
    cvelistv5